pub trait Reference: Sealed {
type Target: ?Sized;
}Expand description
This trait is implemented for all references. Rust has only two types
of references to a type T: ?Sized, namely &T and &mut T.
This trait is sealed and can not be implemented for any other types.
§Example use
This trait makes it possible to accept both immutable and mutable references as generic type parameters.
use deferred_reference::Reference;
use core::fmt::Debug;
pub struct RefContainer<T>(T) where T: Reference;
fn main() {
let mut value = 42;
let immutable_ref = RefContainer(&value); // takes an immutable...
let mutable_ref = RefContainer(&mut value); // ... or mutable reference.
//let owned = RefContainer(value); // not a reference, so not allowed
// this also works for references to trait objects:
fn dyn_ref(reference: &dyn Debug) -> RefContainer<&dyn Debug> {
RefContainer(reference)
}
let dyn_ref: RefContainer<&dyn Debug> = dyn_ref(&value);
}